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Hold on - if interstellar travel is possible it is either
a) possible at speeds faster than light or
b) it is not
If b) is the case, then to travel from one star to the next would likely take generations, and no matter how exciting the scientific prospect, or lucrative the trade run, I can't see visitors coming over for any other reason than that they have nowhere else to go - which, considering the size of the universe is equally unlikely.
If a) if the case, it is still no small undertaking - and the energies involved would likely show up on our monitoring equipment - you can't just bend space without anyone noticing. If it is possible, then it can only be achieved by the most advanced of races, who would also have such an in-depth knowledge of the universe that they should be able to simply create anything imaginable making interstellar trade unnecessary.
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